/Engine/Plugins/Runtime/MeshModelingToolset/Source/MeshModelingTools/Public/EditMeshPolygonsTool.h
Outset the current set of selected faces. Click in viewport to confirm outset distance.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(CallInEditor, Category=TriangleEdits, Meta=(DisplayName="Outset", DisplayPriority=3)) void Outset()